Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A system for determining a frequency error of an orthogonal frequency division multiplexing (OFDM) signal having a first frequency, the system comprising: a plurality of filters configured to output a plurality of second signals, each of the plurality of second signals corresponding to a respective one of a plurality of different frequency bands of the OFDM signal, wherein each of the plurality of second signals includes a corresponding synchronization symbol associated with the OFDM signal, and a Fourier transform circuit configured to i) receive the plurality of second signals from each of the plurality of filters and ii) output the plurality of second signals, wherein the system is configured to determine the frequency error of the OFDM signal based on the synchronization symbols of the plurality of second signals using one of respective correlation angles associated with each of the plurality of second signals, and a sum of a band shift frequency error and a sampling frequency error.
A system determines the frequency error in an OFDM signal. It uses multiple filters, each isolating a different frequency band of the OFDM signal and outputting a corresponding signal. Each of these filtered signals contains a synchronization symbol. A Fourier transform circuit processes these signals. The system then calculates the frequency error of the original OFDM signal by analyzing the correlation angles associated with each filtered signal, combining a band shift frequency error and a sampling frequency error.
2. The system of claim 1 , wherein the band shift frequency error corresponds to an average frequency error of the plurality of second signals.
The system for determining a frequency error of an OFDM signal, which uses multiple filters and a Fourier transform circuit, calculates a band shift frequency error. This band shift frequency error, used to determine the overall frequency error, is the average frequency error across all the filtered signals corresponding to the different frequency bands of the original OFDM signal.
3. The system of claim 1 , wherein the sampling frequency error corresponds to a linear regression of the respective correlation angles.
The system for determining a frequency error of an OFDM signal, which uses multiple filters and a Fourier transform circuit, calculates a sampling frequency error. This sampling frequency error, used to determine the overall frequency error, is derived from performing a linear regression on the correlation angles calculated for each of the filtered signals.
4. The system of claim 1 , wherein determining the frequency error includes i) calculating the respective correlation angles associated with each of the plurality of second signals, ii) performing a linear regression of the correlation angles in each of the plurality of second signals, and iii) estimating an analog translation frequency error based on the linear regression.
The system for determining a frequency error of an OFDM signal, which uses multiple filters and a Fourier transform circuit, determines the frequency error by first calculating correlation angles for each filtered signal. Then, it performs a linear regression on these correlation angles. Finally, it estimates an analog translation frequency error based on the result of the linear regression, contributing to the overall frequency error determination.
5. The system of claim 1 , wherein each of the plurality of second signals output from the Fourier transform circuit has a second frequency that is less than the first frequency.
The system for determining a frequency error of an OFDM signal uses multiple filters and a Fourier transform circuit. The filtered signals output from the Fourier transform circuit have a frequency that is lower than the frequency of the original OFDM signal being analyzed. This frequency reduction is part of the signal processing for frequency error determination.
6. The system of claim 5 , wherein the system is configured to: detect the synchronization symbols in the plurality of second signals having the second frequency; and detect a start of OFDM symbols in the OFDM signal based on the detected synchronization symbols.
The system, where the filtered signals from the Fourier transform circuit have a lower frequency than the original OFDM signal, detects the synchronization symbols within these lower-frequency signals. Based on detecting these synchronization symbols, the system then detects the start of the OFDM symbols in the original OFDM signal, enabling synchronization.
7. The system of claim 1 , wherein the synchronization symbols of each of the plurality of second signals are the same.
In the system for determining a frequency error of an OFDM signal using multiple filters and a Fourier transform circuit, the synchronization symbols included in each of the filtered signals are identical across all the different frequency bands. This ensures consistency in synchronization across the different filtered signals.
8. A method for determining a frequency error of an orthogonal frequency division multiplexing (OFDM) signal having a first frequency, the method comprising: outputting a plurality of second signals, each of the plurality of second signals corresponding to a respective one of a plurality of different frequency bands of the OFDM signal, wherein each of the plurality of second signals includes a corresponding synchronization symbol associated with the OFDM signal, and based on the synchronization symbols of the plurality of second signals, determining the frequency error of the OFDM signal using one of respective correlation angles associated with each of the plurality of second signals, and a sum of a band shift frequency error and a sampling frequency error.
A method determines the frequency error in an OFDM signal. It involves outputting multiple signals, each corresponding to a different frequency band of the OFDM signal. Each of these signals includes a synchronization symbol. The method then determines the frequency error of the original OFDM signal based on these synchronization symbols, using correlation angles associated with each signal, and combining a band shift frequency error and a sampling frequency error.
9. The method of claim 8 , wherein the band shift frequency error corresponds to an average frequency error of the plurality of second signals.
The method for determining a frequency error of an OFDM signal, which involves outputting multiple filtered signals each with a synchronization symbol, calculates a band shift frequency error. This band shift frequency error, used to determine the overall frequency error, is the average frequency error across all the filtered signals.
10. The method of claim 8 , wherein the sampling frequency error corresponds to a linear regression of the respective correlation angles.
The method for determining a frequency error of an OFDM signal, which involves outputting multiple filtered signals each with a synchronization symbol, calculates a sampling frequency error. This sampling frequency error, used to determine the overall frequency error, is derived from performing a linear regression on the correlation angles calculated for each of the filtered signals.
11. The method of claim 8 , wherein determining the frequency error includes i) calculating the respective correlation angles associated with each of the plurality of second signals, ii) performing a linear regression of the correlation angles in each of the plurality of second signals, and iii) estimating an analog translation frequency error based on the linear regression.
The method for determining a frequency error of an OFDM signal, which involves outputting multiple filtered signals each with a synchronization symbol, determines the frequency error by first calculating correlation angles for each filtered signal. Then, it performs a linear regression on these correlation angles. Finally, it estimates an analog translation frequency error based on the result of the linear regression, contributing to the overall frequency error determination.
12. The method of claim 8 , wherein each of the plurality of second signals has a second frequency that is less than the first frequency.
The method for determining a frequency error of an OFDM signal involves outputting multiple filtered signals. These filtered signals have a frequency that is lower than the frequency of the original OFDM signal being analyzed. This frequency reduction is part of the signal processing for frequency error determination.
13. The method of claim 12 , further comprising: detecting the synchronization symbols in the plurality of second signals having the second frequency; and detecting a start of OFDM symbols in the OFDM signal based on the detected synchronization symbols.
The method, where the filtered signals have a lower frequency than the original OFDM signal, detects the synchronization symbols within these lower-frequency signals. Based on detecting these synchronization symbols, the method then detects the start of the OFDM symbols in the original OFDM signal, enabling synchronization.
14. The method of claim 8 , wherein the synchronization symbols of each of the plurality of second signals are the same.
In the method for determining a frequency error of an OFDM signal using multiple filtered signals, the synchronization symbols included in each of the filtered signals are identical across all the different frequency bands. This ensures consistency in synchronization across the different filtered signals.
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September 16, 2014
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